Патент USA US2123997код для вставки
July 19, 1938. J. F. .méousEK 2,123,997 SHEEi‘ HOLDING MEANS FOR CYLINDERS OF PRINTING PRESSES AND THE LIKE’ Filed May 1, 1935' ; a9 // o [/0 ML l‘épQ/bl i c/ INVENTOR. f a 5343/ ATTORNEY , ‘I 7 2,123,997 Patented July 19, 1938v ‘ ‘UNITED; STATES PATENT, orrlcr. 2,123,997 SHEET-ROWING lVIEANS FOR CYLINDERS OF PRINTING PRESSES AND‘ THE LIKE Joseph F. Jirousek, Cleveland, Ohio, assignor to ‘The Chandler & Price Company, Cleveland, Ohio, a corporation of Ohio , . Application May 1, 1935, Serial No. 19,206 ~‘ 7 Claims. (01. 101-4151) This invention relates to means for holding sheet material on cylinders. such as of printing presses, lithographing presses and the like; and it is among the objects of the invention to pro 5 vide a construction in which the operation of clamping the sheet is simple and reliable. A further object is the provision of structure in which a pull of the sheet itself serves to tighten the holding. A further object is the provision of 10 accuracy of alignment after the sheet is clamped.’ A still further object is the provision of quick acting release for removal of the clamped sheet. Other objects and advantages will appear as the description proceeds. _ To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully‘described, and articuT larly pointed out inpthe claims, the following de scription and the annexed drawing setting forth. 20 in detail certain illustrative embodiments of the invention, these being indicative however, of but a few of the various ways in which the principle of the invention may be employed. In said annexeddrawing:— 25 ' Fig. 1 is a plan view of a cylinder embodying the invention; Fig. 2 is a transverse section thereof, on enlarged scale, taken- on a plane sub stantially indicated by line 11-11, Fig. 1; Fig. 3 is a fragmentary similar view showing the parts in releasing position; Figs. 4 and 5 are side eleva tional and frontvelevational views respectively of a detail of the clamping mechanism; and Figs. 6 and '1 are detail sectional views taken substan tially on lines VI—VI and VII—'-VII, respectively, Fig'. 1. duced portions to serve as journalaland these ‘ride respectively in a fork H in the form of a slide having a small excursion of movement on' the plane of the base of the jaw. .The slide it has'a stem extension l5 which rides through a 5 slide mounting opening'in'the baseljaw, and a compression spring l6 surrounding" the stem and\ located between the slide and the jaw'abutments serves to normally urge the slide into its for ,ward position. Rearwardly, of the jaw‘ member 10v ID is a latch l'l pivoted to the jaw member at It, and having an opening through which the stem l5 extends, the opening being such-that the stem passes freely through the latch but when desired the stem may be pulled back by the latch to release the jaw member l2, by reasonof the latch coming against an abutment-pin IS on the stem for such release movement; The in clined plane upon which the roller, l2 moves is conveniently provided by end members if!’ se cured to the base jaw It by suitable screws s.‘ With such arrangement, .the jaw-roller l2 with its slide it may have ‘a range of movement within the space between the jaw member iii and the jaw member II, and as the roller moves for: wardly it travels up the inclined plane surfaces l3’, I3’ and thereby binds more tightly against the plate to grip the same ‘against the jaw ll. The latter may be knurled or roughened on its . gripping surface.‘ Conversely, with movement 30 of the roller l2 rearwardly, it ‘travels down the inclined plane surfaces and ‘recedes from its‘ gripping positionpthereby loosening the sheet, rubber blanket,_or plate. The base jaws it are ~ set on a rock-shaft 20, and by provision of a The cylinder body C may be of any usual or preferred construction, and may involve for in spring 2! between the shell 2, in a suitable abuti ' ment recess 22 for instance while the other end stance a shell 2 having a ledge 3 upon which are carried means for holding one end of a. sheet P, such for instance as a zinc lithographic plate, such rearward thrust on the jaws i0 is had, thus tend- ‘ means comprising a fixed jaw Q, and a cooperating of the spring seats against an abutment plate 23 carried by the shank of the jaw Ill, a uniform ing to maintain suitable tension and tightening action upon the sheet being held. A screw head 24 may convenient-1y serve as centering and reg tightening means, such as screws 7. Desirably, the taining means for the spring with respect to the abutment plate 23. The jaw body l0, 1 I, may be , 45 latter have recessed heads or an internal wrench- , swung forward on shaft 20 against the action of hold 8, thereby offering little obstruction ex the spring if a hand tool be inserted in a conven ternally. With the sheet fastened by the series of end-holding jaws 5, the body of the sheet is " ient hole 9 for this purpose, thus aifording a ' I drawn around the cylinder to engage in the handle and leverage. adjustable jaw 5, the latter being tightened into holding position againstgthe end of the sheet 6 by take-up holding jaws. These‘comprise relatively ?xed jaws 10, including an over-hanging beak portion H, and a movable jaw member l2 in the form of a roller mounted for limited rolling move ment on an inclined plane or wedging plane l3. 55 Desirably, the rollers [2 have gudgeons or re By providing the jaw member 4 in the form of a bar in common for the entire set of end clamps,,a_ nicety of adjustment after the sheet is gripped, may be had. It sometimes occurs that even when properly initially gauged, a sheet or lithographic plate is ultimately found to be 5.5 2 .10 i 2,123,997 lghtly misaligned, and by the present. means us may be corrected. By mounting the jaw-bar and an inclined surface upon which said roller 4 on a central pivot, as bolt 25, it may be slightly swung in’its plane with respect to the cylinder. An adjusting thrust-screw 28 at each end of the .bar, abutting'against a suitable surface on the 2. In mechanism of the character described, a cylinder and means for holding sheet material element may travel. _ about its periphery, including a plurality of jaw coupies for holding one end of the sheet to the cylinder, said couples having each an interposed cylinder thus serves to advance or retard one end of the bar as compared with the other, ,as spring and a gauge pin, a bar in common mount may be necessary in any given instance to skew _ ing said jaw-couples, a central pivot for said bar, the sheet or plate sumciently to effect the desired alignment. The jaws l, 5, are provided with gauge pins 21, these being ?xed in the jaw-bar and projecting into openings 28 in the jaw 5. By provision of a lip-lug 29 on the jaw 5, engage ment of the latter relative to the jaw l is assured in uniform manner, so'that the gauge pins 21 will always properly enter the openings 28 in the cooperating jaw and not- interfere. The. jaw 5. is normally urged into open position by a spring 20 30 between the jaws, centered about a retaining pin 3i and seating at each end in appropriate recesses in the jaw surfaces. The manner of use of the device will be under; stood from the foregoing. A sheet to be held in 25 position, for instance a zinc lithographic plate is brought into position with one end in the jaws a regulating screw at each endof said bar, and self-tightening clamp means for the other end of the sheet, said means having a roller-jaw ele ment and a jaw element for receiving the same, an inclined surface‘ upon which said roller ele ment may travel, a slide for mounting said roller-jaw element, a stem extending rearwardly from said slide through said other jaw element, and a spring interposed between said slide and said other jaw element. 3. In mechanism of the character described, a 20 cylinder and means for holding sheet'material about its periphery, including a plurality of jaw .couples- for holding one 'end of the sheet to the cylinder, said couples having each an interposed ' With the spring and a gauge pin,'a bar in common mount 25 ing said jaw-couples, a central pivot for said bar, a regulating screw at each end of said bar, and self-tightening clamp means for the other end of the sheet, said means having a roller-jaw ele 30 end of the plate pushed into position against the ment and ajaw element for receiving the same, 30 I, 5, these being initially in open position, ‘the screws 1 being released for that purpose so that the springs 3D maintain them open. row of gauge pins 21., the movable jaws are setv an inclined surface upon’which said roller ele ment may‘ travel, a slide for ‘mounting said down into clamping position by wrench-tighten ing .each of the screws 1, and thereby this end roller-jaw element, a ,stem extending rearwardly of the plate is gripped. The plate is ‘then 35 wrapped around the cylinder and, as the opera tor swings the jaws ll forwardly byQa hand from said slide through said other jaw element, a spring interposed between said slide and said other jaw element, and a releasing latch for . wrench or tool inserted into one of the holes 9, engaging said stem. 4. In mechanism of the character described, a the farther end of the plate is thrust into the jaws II, and rides over the jaw-rollers l2, these - cylindur and means for: holding sheet material 40 being displaced backwardly on the give ‘of the about its periphery, including a plurality oi’ jaw- ’ springs l3, sufficiently to allow such admission, but immediately on cessation of the thrusting movement of the plate, the jaw-rollers I! hold the plate. When it is desired to remove the 45 sheet P, the latches I‘! are drawn back from the jaws ll thereby pulling the stems l5 and jaw rollers l2. into release and the sheet may be ‘ drawn out of the jaws. Undue movement of the . jaw units III is guarded against in any position ing by suitable stops. Thus, a ‘stop-projection 33 carried by the jaw at the rear, by vengaging against the shoulder 34 on the cylinder prevents the jaw being swung too far, back. A stop pro 56 jection 35 at the front of the jaw serves to abut against the cylinder and prevent the jaw itself from contacting closely.- ' Other modes of applying the‘ principle of the invention may be employed, change being'made as regards the details described, provided ‘the features set forthin any of the following claims, or ,the equivalent of such, be employed. . I therefore particularly point out‘ and dis tinctly claim as my invention:— 65 1. In mechanism of the character described, a cylinder and means for holding sheet material about its periphery, including a plurality of jaw couples for holding one end of the sheet to the cylinder, said couples having each an interposed 70 spring and a gauge pin, a bar in common-mount ing said jaw-couples, a central pivot for said bar, a regulating screw at each end of said bar, and self-tightening clamp means for the other end of the sheet, said means having a roller-jaw ele— 76 ment and a jaw element for receiving the same, couples for holding. one end of the sheet, each couple having an interposed spring and a gauge pin,- a bar for mounting said couples in common, a pivot centrally of said bar, an adjustablescrew at each end of said bar, and self-tightening clamp means for the other end-of‘ the sheet. said means having a plurality of roller-jaw elements, cooperating jaw elements receiving the same, ‘a rock-shaft upon which said cooperating jaw elements are carried, a spring normally swinging 50 said cooperating jaw elements rearwardly, and an inclined plane surface upon which each roller-jaw element may travel. 5. In mechanism of the character described, a i , cylinder and means for holding sheet material about its periphery, including a plurality of jaw couplesv for holding one end of the sheet, each couple having an interposed spring and a gauge pin, a bar for mounting said couples in common, a pivot centrally of said bar, an adjustable screw 60 at each end of said bar, and self-tightening clamp means for the other end of the sheet, said means having a plurality of roller-jaw elements, cooperating jaw elements receiving the same, a rock-shaft upon which said cooperating jaw ele-‘ 65 ments are carried, a spring normally swinging said cooperating jaw elements rearwardly, an in clined plane surface upon which each roller-jaw element may travel, a slide carrying each roller jaw element,‘ a stern extending from said 'slide, 70 and a releasing latch for engaging said stem. _ 6. In mechanism of the character described, a cylinder and means for holding sheet material about its periphery, including a jaw member ex tending substantially the length of said cylinder. 9,123,997 means extending through said jaw member for mounting the same pivotally to swing in the plane‘ of the end of the sheet to be gripped, a plurality of jaw elements mounted on said jaw member and cooperating with the latter to grip the sheet material, and adjusting screw means for regulating the amount of swing-position of said jaw member relative to the cylinder.‘ , '7. In mechanism ‘of the character described, a. 0 cylinder and means for holding sheet material about its periphery? including a jaw member en . - - r 3 tending substantially the length of said cylinder, means ‘extending through said jaw member for mounting the same pivotally to swing in the plane of the end of the sheet to be gripped, a plurality of jaw elements mounted on said jaw members and cooperating withthe latter to grip the sheet material, adjusting screw means for regulating the amount 01' swing of said jaw member relative to the cylinder, and springs interposed between said jaw elements and jaw member. -' . I JOSEPH F. JIROUSEK.